硫循环可能会掩盖当代甲透环境中的动态生物驱动的铁氧化还原循环
Isabel R Baker1,2, Peter R Girguis1
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA.
Environmental microbiology reports
|May 5, 2024
概括
深海透的甲含有氧化铁的细菌,但硫循环通常会限制铁的可用性. 消除硫酸盐使微生物铁循环,揭示了微生物群落在这些富有生产力的海洋生态系统的转变.
科学领域:
- 海洋微生物学 海洋微生物学
- 生物地质化学生物地质化学
- 深海生态 深海生态
背景情况:
- 深海的甲透是具有低氧和微生物社区驱动甲氧化的高生产力生态系统.
- 铁 (Fe2+) 通过各种还原过程产生,这表明可能存在氧化铁的微生物.
- 由于硫化物迅速吸收,形成铁硫化物,因此Fe2+的生物利用性受到质疑.
研究的目的:
- 研究深海甲泄漏处氧化铁细菌的存在和活性.
- 为了确定微生物铁氧化是否可以超过无生物硫化铁沉.
- 了解硫循环在调节铁的生物可用性中的作用.
主要方法:
- 从卡斯卡迪亚边缘的甲入沉积物中建立了丰富培养.
- 测试了含硫酸盐和不含硫酸盐的培养物,以评估微生物铁氧化.
- 监测了铁氧化还原循环,并使用16S rRNA基因测序分析了微生物群落.
主要成果:
- 富化介质中的硫酸盐抑制了微生物的铁氧化,导致硫化铁沉.
- 硫酸盐贫乏的介质促进了动态的铁氧化还原循环和生物的铁 (oxyhydr) 氧化物形成.
- 硫酸盐的去除使微生物群落从Gammaproteobacteria转移到Rhodobacteraceae的主导地位.
结论:
- 通过微生物和非生物过程的硫循环,显著限制了甲漏的生物"铁轮".
- 氧化铁的细菌可以在甲漏中活跃,但它们的活动受到硫化学的限制.
- 了解这些微生物过程对于理解深海环境中的生物地球化学循环至关重要.
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